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Subsequent Events (Details Textual) (Subsequent Event, Issuance of Equity, USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended
Jan. 04, 2013
Subsequent Event | Issuance of Equity
 
Subsequent Event [Line Items]  
Option to purchase additional shares 525,000
Exercise price of shares 17.25
Proceeds from sale of shares, net of underwriting discount and estimated expenses $ 8.5